CN110197642B

CN110197642B - Method for acquiring tricolor brightness correction relationship, correction method and correction device of display

Info

Publication number: CN110197642B
Application number: CN201910465668.6A
Authority: CN
Inventors: 韩东旭; 王铁石; 吴仲远; 陈伟; 谢恩明; 张弛; 李永谦
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-12-18
Anticipated expiration: 2039-05-30
Also published as: CN110197642A; US20210166606A1; WO2020238960A1

Abstract

The embodiment of the invention provides a method for acquiring a tricolor brightness correction relation, a method for correcting a display and a correction device, which relate to the field of display and can keep the white color temperature of the display consistent under different gray scales. A method for obtaining a three-primary-color brightness correction relation comprises the following steps: respectively acquiring red, green and blue color coordinates of a display; calculating to obtain initial red brightness, initial green brightness and initial blue brightness; calculating to obtain the corresponding brightness values of red, green and blue under each gray scale; measuring red, green and blue color coordinates to generate a list; calculating to obtain a second red brightness, a second green brightness and a second blue brightness; obtaining and storing a red brightness correction relation according to the second red brightness and the red brightness value; obtaining and storing a green brightness correction relation according to the second green brightness and the green brightness value; and obtaining and storing the brightness correction relation of blue according to the second blue brightness and the blue brightness value.

Description

Method for acquiring tricolor brightness correction relationship, correction method and correction device of display

Technical Field

The invention relates to the field of display, in particular to a method for acquiring a tricolor brightness correction relation, a correction method and a correction device of a display.

Background

Currently, an Organic Light Emitting Diode (OLED) Display is a mainstream Display panel in the market, and compared with a Liquid Crystal Display (LCD), the OLED Display has the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, and the like.

The gray scale curve is a characteristic curve describing the relationship between the gray scale of the display and the brightness change, and in order to ensure the consistency between the brightness of the display and the vision of human eyes, gamma correction is introduced in the manufacturing of the OLED display, so that the display effect of the OLED display achieves the best effect.

However, in the prior art, when the brightness is adjusted through gamma correction, color coordinates formed by color mixing of three primary colors with the gray scale have a certain difference in all gray scale ranges, which causes the phenomenon of inconsistent white color temperature.

Disclosure of Invention

The embodiment of the invention provides a method for acquiring a tricolor brightness correction relationship, a method for correcting a display and a correction device, which can keep the white color temperature of the display consistent under different gray scales.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in one aspect, an embodiment of the present invention provides a method for obtaining a three-primary-color luminance correction relationship, including: setting a target white color coordinate, a target white brightness and a gamma value; respectively acquiring stable red color coordinates, green color coordinates and blue color coordinates when a display displays a red picture, a green picture and a blue picture; calculating to obtain initial red brightness, initial green brightness and initial blue brightness according to the stable red color coordinate, the stable green color coordinate and the stable blue color coordinate, the stable target white color coordinate and the stable target white brightness; calculating to obtain corresponding brightness values of red, green and blue under each gray scale according to the initial red brightness, the initial green brightness, the initial blue brightness and the gamma value; measuring the color coordinates of the red, green and blue under each gray scale, and generating a list of corresponding relations of the gray scales, the brightness values and the color coordinates of the red, green and blue respectively; selecting R gray scales; r is more than or equal to 2 and is a positive integer; acquiring color coordinates of red, green and blue corresponding to the R gray scales according to the list, and calculating to obtain second red brightness, second green brightness and second blue brightness corresponding to each gray scale of the R gray scales according to the target white color coordinate and the target white brightness; obtaining and storing a red brightness correction relation according to the second red brightness corresponding to each gray scale of the R gray scales and the red brightness value of each gray scale of the R gray scales acquired from the list; obtaining and storing a green brightness correction relation according to the second green brightness corresponding to each gray scale of the R gray scales and the green brightness value of each gray scale of the R gray scales acquired from the list; and obtaining and storing a blue brightness correction relation according to the second blue brightness corresponding to each gray scale of the R gray scales and the blue brightness value of each gray scale of the R gray scales acquired from the list.

Optionally, calculating an initial red luminance, an initial green luminance, and an initial blue luminance according to the stable red color coordinate, the stable green color coordinate, and the stable blue color coordinate, and the stable target white color coordinate and the stable target white luminance, and includes: calculating to obtain an initial red brightness proportion, an initial green brightness proportion and an initial blue brightness proportion according to the stable red color coordinate, the stable green color coordinate, the stable blue color coordinate and the stable target white color coordinate; and calculating to obtain initial red brightness, initial green brightness and initial blue brightness according to the initial red brightness proportion, the initial green brightness proportion, the initial blue brightness proportion and the target white brightness.

Optionally, calculating, according to the initial red brightness, the initial green brightness, the initial blue brightness, and the gamma value, a brightness value corresponding to each gray scale for red, green, and blue, includes: acquiring the number of gray scales of a display; taking the initial red brightness, the initial green brightness and the initial blue brightness as corresponding brightness values of red, green and blue under the maximum gray scale respectively;

according to the relationship among the gray scale, the corresponding brightness value and the gamma value

Respectively calculating to obtain the brightness values of the red, the green and the blue corresponding to each gray scale; wherein GAM is gamma value; MAX is the maximum gray scale, X is the Xth gray scale, L is the brightness value corresponding to the maximum gray scale, L_XIs the brightness value corresponding to the X-th gray scale, wherein X is an integer.

Optionally, obtaining color coordinates of red, green, and blue corresponding to the R gray scales according to the list, and calculating a second red luminance, a second green luminance, and a second blue luminance corresponding to each gray scale of the R gray scales according to the target white color coordinate and the target white luminance, including: acquiring the color coordinates of red, green and blue corresponding to the R gray scales according to the list, and respectively calculating to obtain a first intermediate red brightness proportion, a first intermediate green brightness proportion and a first intermediate blue brightness proportion under the R gray scales according to the target white color coordinate; and respectively calculating to obtain the second red brightness, the second green brightness and the second blue brightness corresponding to each gray scale of the R gray scales according to the first intermediate red brightness proportion, the first intermediate green brightness proportion, the first intermediate blue brightness proportion and the target white brightness which respectively correspond to the R gray scales.

Optionally, obtaining color coordinates of red, green, and blue corresponding to the R gray scales according to the list, and calculating a second red luminance, a second green luminance, and a second blue luminance corresponding to each gray scale of the R gray scales according to the target white color coordinate and the target white luminance, including: acquiring the color coordinates of red, green and blue corresponding to the R gray scales according to the list, and respectively calculating to obtain a first intermediate red brightness proportion, a first intermediate green brightness proportion and a first intermediate blue brightness proportion under the R gray scales according to the target white color coordinate; respectively calculating to obtain first intermediate red brightness, first intermediate green brightness and first intermediate blue brightness corresponding to each gray scale of the R gray scales according to a first intermediate red brightness proportion, a first intermediate green brightness proportion, a first intermediate blue brightness proportion and the target white brightness corresponding to the R gray scales;

circulating the following steps at least once:

according to the first middle red brightness, the first middle green brightness and the first middle blue brightness corresponding to each gray scale of the R gray scales, obtaining the color coordinates of red, green and blue corresponding to the R gray scales from the list, and according to the target white color coordinate, calculating to obtain a second middle red brightness proportion, a second middle green brightness proportion and a second middle blue brightness proportion corresponding to each gray scale of the R gray scales; calculating to obtain a second intermediate red brightness, a second intermediate green brightness and a second intermediate blue brightness corresponding to each gray scale of the R gray scales according to a second intermediate red brightness proportion, a second intermediate green brightness proportion, a second intermediate blue brightness proportion and the target white brightness corresponding to each gray scale of the R gray scales; taking the second intermediate red brightness, the second intermediate green brightness and the second intermediate blue brightness obtained in the previous time as the first intermediate red brightness, the first intermediate green brightness and the first intermediate blue brightness respectively once per cycle; and after the last cycle is finished, respectively taking the second intermediate red brightness, the second intermediate green brightness and the second intermediate blue brightness as the second red brightness, the second green brightness and the second blue brightness.

In yet another aspect, an embodiment of the present invention further provides a computer device, including a storage unit and a processing unit; the storage unit stores therein a computer program executable on the processing unit; the processing unit implements the method for obtaining the three primary color luminance correction relationship as described above when executing the computer program.

On the other hand, the embodiment of the present invention further provides a computer readable medium, which stores a computer program, and the computer program, when executed by a processor, implements the method for obtaining the three primary color luminance correction relationship as described above.

In another aspect, an embodiment of the present invention further provides a method for correcting a display, including: measuring the red brightness, the green brightness and the blue brightness of the display at each gray scale; calculating to obtain target red brightness, target green brightness and target blue brightness under each gray scale according to the red brightness correction relation, the green brightness correction relation and the blue brightness correction relation obtained by the method for obtaining the three-primary-color brightness correction relation, and the red brightness, the green brightness and the blue brightness under each gray scale obtained by measurement; acquiring target driving voltages corresponding to the target red brightness, the target green brightness and the target blue brightness under each gray scale; and adjusting the driving voltage of each gray scale of the display to the target driving voltage, so that the red brightness of each gray scale is up to the target red brightness, the green brightness of each gray scale is up to the target green brightness, and the blue brightness of each gray scale is up to the target blue brightness.

In another aspect, an embodiment of the present invention further provides a calibration apparatus for a display, including: a measurement module configured to measure red, green, and blue luminance of the display at each gray level; the calculation module is configured to calculate and obtain target red brightness, target green brightness and target blue brightness under each gray scale according to the red brightness correction relationship, the green brightness correction relationship and the blue brightness correction relationship obtained by the obtaining method of the three-primary-color brightness correction relationship, and the measured red brightness, green brightness and blue brightness under each gray scale; the acquisition module is configured to acquire target driving voltages corresponding to target red brightness, target green brightness and target blue brightness under each gray scale; the adjusting module is configured to adjust the driving voltage of each gray scale of the display to a target driving voltage, so that the red brightness of each gray scale is up to a target red brightness, the green brightness of each gray scale is up to a target green brightness, and the blue brightness of each gray scale is up to a target blue brightness.

The embodiment of the invention provides a method for acquiring a tricolor brightness correction relationship, a method for correcting a display and a device for correcting the display, which are characterized in that firstly, stable red color coordinates, green color coordinates and blue color coordinates when the display displays a red picture, a green picture and a blue picture are acquired, and initial red brightness, initial green brightness and initial blue brightness are calculated according to a set target white color coordinate and a set target white brightness; then, calculating to obtain the brightness values of the red, the green and the blue under each gray scale through the initial red brightness, the initial green brightness, the initial blue brightness and the gamma value; generating a list of corresponding relations of gray scales, brightness values and color coordinates of the red, the green and the blue respectively by measuring the color coordinates of the red, the green and the blue under each gray scale; then, according to the color coordinates of red, green and blue corresponding to the R gray scales selected from the list, and according to the target white color coordinate and the target white brightness, calculating to obtain a second red brightness, a second green brightness and a second blue brightness corresponding to each gray scale of the R gray scales; and finally, respectively obtaining and storing the brightness correction relations of red, green and blue according to the second red brightness, the second green brightness and the second blue brightness corresponding to each gray scale of the R gray scales and the red brightness value, the green brightness value and the blue brightness value of each gray scale of the R gray scales acquired from the list. Therefore, the method can simply and quickly acquire the tricolor brightness correction relationship, and when the tricolor brightness of the display is corrected, the method is applied to keep the white color temperature of the display consistent.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flowchart of a method for obtaining a three-primary-color luminance correction relationship according to an embodiment of the present invention;

fig. 2 is a flowchart of another method for obtaining a three-primary-color luminance correction relationship according to an embodiment of the present invention;

fig. 3 is a flowchart of another method for obtaining a three-primary-color luminance correction relationship according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the list generated at S50 in FIG. 1;

fig. 5 is a flowchart of another method for obtaining a luminance correction relationship between three primary colors according to an embodiment of the present invention;

fig. 6 is a flowchart of another method for obtaining a three-primary-color luminance correction relationship according to an embodiment of the present invention;

fig. 7 is a flowchart of another method for obtaining a three-primary-color luminance correction relationship according to an embodiment of the present invention;

FIG. 8 is a flowchart illustrating a method for calibrating a display according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a calibration apparatus module of a display according to an embodiment of the present invention.

Reference numerals:

1-a measurement module; 2-a calculation module; 3-an acquisition module; 4-adjusting the module.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The gray scale is the brightness variation of the brightest and darkest of the display and is divided into a plurality of parts. The more gradation levels, the more exquisite the picture effect the display can present.

Theoretically, corresponding color coordinates of the three primary colors are the same under different gray scales. That is, the red color coordinates are the same for different gray scales, the green color coordinates are the same for different gray scales, and the blue color coordinates are the same for different gray scales. In addition, in all gray scale ranges, the same gray scale three primary colors are mixed to form achromatization, namely, the same gray scale three primary colors are mixed to form achromatization of black, gray, white and the like, and the achromatization has the same color coordinate.

However, in practice, due to the variation of the tristimulus values of the three primary colors, the color coordinates of the three primary colors at different gray levels are not completely the same, and the achromatic color coordinates are also different.

When the corresponding achromatic color coordinates are inconsistent under different gray scales, the color temperature of the display is inconsistent.

Based on this, an embodiment of the present invention provides a method for obtaining a three-primary-color luminance correction relationship, as shown in fig. 1, including:

and S10, setting the coordinates of the target white color, the brightness of the target white color and the gamma value according to the requirements of customers.

The target white color coordinate refers to a color coordinate which forms achromatic color with three primary colors of gray scale in all gray scale ranges, namely, a theoretical same color coordinate from black to gray to white.

The target white luminance is the luminance corresponding to the same color coordinate when the display displays achromatization at different gray scales, that is, the luminance corresponding to the target white color coordinate.

And S20, acquiring stable red color coordinates, green color coordinates and blue color coordinates when the display displays a red picture, a green picture and a blue picture respectively.

When obtaining stable three primary color coordinates, the corresponding brightness measurement ranges of the display for displaying red, green and blue images can be selected according to experience. Then, when the display displays the red picture, the green picture and the blue picture respectively, the brightness of the red picture, the green picture and the blue picture is gradually increased in the corresponding brightness measurement range, and the corresponding color coordinates are synchronously measured until the color coordinates corresponding to the red, the green and the blue pictures tend to be stable.

It should be noted that, when selecting the respective corresponding luminance measurement ranges, the luminance measurement ranges in which the red color coordinate, the green color coordinate, and the blue color coordinate are significantly changed need to be selected.

For example, according to experience, if the red color coordinate has a significant variation between the luminance ranges 0nit and 100nit, the red luminance measurement range is selected to be 0nit to 100 nit. Then, by changing the magnitude of the driving voltage of the display, the brightness of the red color is adjusted to gradually increase from 0nit to 100nit, for example, 10nit each time. Meanwhile, the luminance meter is used for recording red color coordinates corresponding to different red luminances in sequence. And performing difference operation on the red color coordinate obtained by current measurement and the red color coordinate obtained by last measurement. As the red brightness increases, the red spectrum tends to be stable, the red color coordinate tends to be stable, and the difference result gradually decreases. And when the difference result is less than or equal to the first threshold value, the measurement is finished. At this time, the red color coordinate measured by the luminance meter is regarded as a stable red color coordinate.

For example, when the first threshold is set to 0.01 and the red luminance is 80nit, the red color coordinate is measured to be (0.49,0.52), and when the red luminance is 90nit, the red color coordinate is measured to be (0.50, 0.52). At this time, the difference value of the red color coordinates

The difference D is equal to the first threshold and the measurement ends. The color coordinates (0.50,0.52) were taken as stable red color coordinates.

Similarly, according to experience, if the green color coordinate has obvious change in the brightness range of 0nit to 50nit, the green brightness measurement range is selected to be 0nit to 50 nit. Then, the brightness of green is adjusted by changing the magnitude of the driving voltage of the display. It is gradually increased from 0nit to 50nit, for example, by 5nit each time. Meanwhile, green color coordinates corresponding to different green brightness are recorded in sequence by using a brightness meter. And performing difference operation on the green color coordinate obtained by current measurement and the green color coordinate obtained by last measurement. With the increase of the green brightness, the green spectrum tends to be stable, the green color coordinate is more and more stable, and the difference result is gradually reduced. And when the difference result is less than or equal to the second threshold value, the measurement is finished. At this time, the green color coordinate measured by the luminance meter is regarded as a stable green color coordinate.

Similarly, according to experience, if the blue color coordinate has obvious change in the brightness range of 20nit to 40nit, the blue brightness measurement range is selected to be 20nit to 40 nit. Then, the brightness of blue is adjusted by changing the magnitude of the driving voltage of the display. It is gradually increased from 20nit to 40nit, for example, by 2nit each time. Meanwhile, the luminance meter is used for recording blue color coordinates corresponding to different blue luminances in sequence. And performing difference operation on the blue color coordinate obtained by current measurement and the blue color coordinate obtained by last measurement. As the blue brightness increases, the blue spectrum tends to be stable, the blue color coordinate becomes more and more stable, and the difference result gradually decreases. And when the difference result is less than or equal to the third threshold value, the measurement is finished. At this time, the blue color coordinate measured by the luminance meter is regarded as a stable blue color coordinate.

Wherein, the respective luminance measurement ranges of the three primary colors may be different, and the magnitude of the increase in luminance may be different when the respective luminance ranges are measured. Meanwhile, the set first threshold, second threshold and third threshold may be the same or different, and the present invention is not limited to this.

And S30, calculating to obtain initial red brightness, initial green brightness and initial blue brightness according to the stable red color coordinate, the stable green color coordinate and the stable blue color coordinate obtained as described above and the target white color coordinate.

Optionally, in S30, calculating an initial red luminance, an initial green luminance, and an initial blue luminance according to the stable red color coordinate, the stable green color coordinate, and the stable blue color coordinate, and the stable target white color coordinate and the target white luminance, as shown in fig. 2, includes:

s301, calculating to obtain an initial red brightness proportion, an initial green brightness proportion and an initial blue brightness proportion according to the stable red color coordinate, the stable green color coordinate, the stable blue color coordinate and the stable target white color coordinate.

Based on the CIE color space established by the Commission Internationale de L' Eclairage (CIE), it can be known that in the CIE XYZ system, the relationship between the color coordinates of the three primary colors and the luminance ratio is:

P_B＝1-P_R-P_G。

wherein (x)_R,y_R,x_R) Is the red color coordinate in CIE XYZ system, (x)_G,y_G,z_G) As the green color coordinate in the CIE XYZ system, (x)_B,y_B,z_B) As the blue color coordinate in CIE XYZ system, (x)_W,y_W,z_W) Is CIE XYWhite color coordinate in Z system, P_RIs the ratio of red luminance in the CIE XYZ system, P_GIs the green luminance ratio, P, in the CIE XYZ system_BIs the ratio of blue luminance in the CIE XYZ system.

And because the coordinates in the XYZ directions have the following relationship:

z_W＝1-x_W-y_W- - -formula (IV).

z_R＝1-x_R-y_R- - -equation (five).

z_G＝1-x_G-y_G- - -equation (six).

z_B＝1-x_B-y_B- - -formula (VII).

Substituting the above equations (four), (five), (six) and (seven) into the equation (one), equation (two) and equation (three), thereby converting the relationship between the color coordinates and the luminance ratio in the CIE XYZ system into the relationship between the color coordinates and the luminance ratio in the CIE XYZ system, that is:

P_B＝1-P_R-P_G- - -equation (ten).

For example, the target white color coordinate is set to (x) according to the customer's requirement_w,y_w) And according to S20, the measured stable red color coordinate is (x)_r,y_r) Stable green color coordinate of (x)_g,y_g) And a stable blue color coordinate of (x)_b,y_b) Substituting it into formula (eight), formula (nine) and formula (ten) can obtain:

P_b＝1-P_r-P_g。

thus, P is calculated_rAs an initial red luminance ratio, P_gAt an initial green luminance ratio, P_bIs the initial blue luminance ratio.

S302, calculating to obtain initial red brightness, initial green brightness and initial blue brightness according to the initial red brightness proportion, the initial green brightness proportion, the initial blue brightness proportion and the target white brightness.

The target white luminance is multiplied by the initial red luminance proportion, the initial green luminance proportion and the initial blue luminance proportion respectively, and the initial red luminance, the initial green luminance and the initial blue luminance can be obtained correspondingly.

Illustratively, the initial red luminance ratio P obtained in S301_rInitial green luminance ratio P_gInitial blue luminance ratio P_bAnd a set target white luminance L of the display_wThrough L_w×P_r＝L_R，L_w×P_g＝L_G，L_w×P_b＝L_BCalculating to obtain initial red brightness L_RInitial green luminance is L_GAnd an initial blue luminance of L_B。

And S40, calculating the brightness value corresponding to the red, the green and the blue at each gray scale according to the initial red brightness, the initial green brightness and the initial blue brightness and the gamma value.

Optionally, in S40, calculating the corresponding luminance values of red, green, and blue at each gray level according to the initial red luminance, the initial green luminance, the initial blue luminance, and the gamma value, as shown in fig. 3, includes:

s401, obtaining the number of gray scales of the display.

If the number of bits of the display data transmission is 6, then there is 2⁶The gray scale value is 0 &63, that is, the number of gradations is 64. If the number of bits of the display data transmission is 8, then there is 2⁸The gray scale value is 0-255, namely the number of gray scales is 256. If the number of bits of the display data transmission is 10, then there is 2¹⁰The gray scales are 0-1023, namely the number of the gray scales is 1024.

S402, taking the initial red brightness, the initial green brightness and the initial blue brightness obtained in the step S302 as the brightness values corresponding to the maximum gray scales of the red, the green and the blue respectively.

That is, the initial red luminance is set as the luminance value of red at the maximum gradation, the initial green luminance is set as the luminance value of green at the maximum gradation, and the initial blue luminance is set as the luminance value of blue at the maximum gradation.

For example, when the maximum gray scale of the display is 255, the initial red brightness L calculated in S302 is used_RInitial green luminance L_GAnd an initial blue luminance L_BAs the brightness values corresponding to the 255 th gray scale for red, green and blue, respectively.

I.e. the initial red luminance L_RThe initial green luminance L is the luminance value of red at the 255 th gray level_GThe initial blue luminance L is the luminance value of green at the 255 th gray level_BAs the luminance value of blue at the 255 th gray level.

S403, obtaining a relation formula according to the gray scale, the corresponding brightness value and the gamma value

And respectively calculating to obtain the brightness value corresponding to each gray scale of the red, the green and the blue.

Wherein GAM is gamma value; MAX is the maximum gray scale, X is the Xth gray scale, L is the brightness value corresponding to the maximum gray scale, L_XIs the brightness value corresponding to the X-th gray scale, wherein X is an integer.

Taking the GAM value as 2.2 and the gray scale value as 0-255 as an example, X is more than or equal to 0 and less than or equal to 255.

Thus, for red, when the 255 th gray level is known to correspond to a luminance value of L_RThen, according toThe above relation can be:

for green, when the brightness value corresponding to the 255 th gray level is known to be L_GThen, according to the above relation, it can be obtained:

for blue, when the brightness value corresponding to the 255 th gray level is known to be L_BThen, according to the above relation, it can be obtained:

based on this, when X is 0, the luminance value of red corresponding to the 0 th gray scale is calculated to be L according to the formula (eleven), the formula (twelve) and the formula (thirteen), respectively_R0Green brightness value of L_G0A blue color brightness value of L_B0。

When X is 150, respectively according to formula (eleven), formula (twelve) and formula (thirteen), calculating to obtain that the brightness value of red corresponding to the 150 th gray scale is L_R150Green brightness value of L_G150A blue color brightness value of L_B150。

When X is 255, the brightness value of red corresponding to the 255 th gray scale is calculated to be L according to the formula (eleven), the formula (twelve) and the formula (thirteen)_R255Equal to the initial red luminance L_RThe brightness value of green is L_G255Equal to the initial green luminance L_GBlue color brightness value of L_B255Equal to the initial blue luminance L_B。

And S50, measuring the color coordinates of the red, the green and the blue at each gray scale, and generating a list of corresponding relations of the gray scales, the brightness values and the color coordinates of the red, the green and the blue respectively.

Taking the number of display gray levels as 256 as an example, as shown in fig. 4, from the 0 th gray level to the maximum gray level (i.e., the 255 th gray level), the luminance meter sequentially measures the color coordinates corresponding to the red, green, and blue at each gray level, and generates a list of the correspondence relationships between the gray levels, luminance values, and color coordinates for the red, green, and blue, respectively.

Since the brightness value corresponding to each gray scale is obtained, after the corresponding color coordinate under each gray scale is obtained, the one-to-one correspondence relationship between the brightness value and the color coordinate is established based on each gray scale.

As can be seen from the above, a list is generated for red, and the luminance value and the color coordinate have a one-to-one correspondence relationship in the list. And generating a list for green, wherein the brightness value and the color coordinate have one-to-one correspondence, and generating a list for blue, wherein the brightness value and the color coordinate have one-to-one correspondence.

S60, selecting R gray scales; r is not less than 2 and is a positive integer.

In an example, 10 gray scales are selected from the 0-255 gray scales according to a rule that one gray scale is selected every 25 gray scales, for example, the 25 th gray scale, the 50 th gray scale and the 75 th gray scale are sequentially selected until the 250 th gray scale.

S70, acquiring the color coordinates of red, green and blue corresponding to the R gray scales according to the list, and calculating to obtain second red brightness, second green brightness and second blue brightness corresponding to each gray scale of the R gray scales according to the target white color coordinate and the target white brightness.

Optionally, in S70, the color coordinates of red, green, and blue corresponding to the R gray scales are obtained according to the list, and according to the target white color coordinate and the target white luminance, the second red luminance, the second green luminance, and the second blue luminance corresponding to each gray scale of the R gray scales are obtained by calculation, as shown in fig. 5, the method includes:

s701, acquiring color coordinates of red, green and blue corresponding to the R gray scales according to the list, and respectively calculating to obtain a first intermediate red brightness proportion, a first intermediate green brightness proportion and a first intermediate blue brightness proportion under the R gray scales according to the target white color coordinate.

For example, according to the gray scale selected in S60, the list obtained in S50 is searched, and as shown in fig. 4, the 25 th gray scale, the 50 th gray scale, and the 75 th gray scale are respectively obtained until the color coordinates of red, green, and blue corresponding to the 250 th gray scale.

Taking the 25 th gray scale as an example, the red color coordinate corresponding to the acquired gray scale is (x)_R25,y_R25) Green color coordinate of (x)_G25,y_G25) Blue color coordinate of (x)_B25,y_B25). The red color coordinate is (x)_R25,y_R25) Green color coordinate of (x)_G25,y_G25) Blue color coordinate of (x)_B25,y_B25) And the set target white color coordinate is (X)_w,Y_w) Substituting the formula (eight), the formula (nine) and the formula (ten), the first intermediate red brightness proportion, the first intermediate green brightness proportion and the first intermediate blue brightness proportion corresponding to the 25 th gray scale are respectively:

P_b25＝1-P_r25-P_g25。

wherein P is calculated_r25A first intermediate red luminance ratio, P, corresponding to the 25 th gray scale_g25A first intermediate green luminance ratio, P, corresponding to the 25 th gray scale_b25Is the first intermediate blue brightness ratio corresponding to the 25 th gray scale.

Similarly, the 50 th gray scale and the 75 th gray scale can be obtained by calculation in sequence until the first intermediate red brightness ratio, the first intermediate green brightness ratio and the first intermediate blue brightness ratio corresponding to the 250 th gray scale.

S702, respectively calculating to obtain a second red brightness, a second green brightness and a second blue brightness corresponding to each gray scale of the R gray scales according to a first intermediate red brightness proportion, a first intermediate green brightness proportion, a first intermediate blue brightness proportion and target white brightness which respectively correspond to the R gray scales.

Illustratively, the first intermediate red luminance ratio P corresponding to the 25 th gray level obtained in S701_r25First intermediate green luminance ratio P_g25First intermediate blue luminance ratio P_b25And a set target white luminance L of the display_wThrough L_w×P_r25＝L'_R25，L_w×P_g25＝L'_G25，L_w×P_b25＝L'_B25Respectively calculating to obtain a second red brightness L 'corresponding to the 25 th gray scale'_R25And the second green luminance is L'_G25And the second blue luminance is L'_B25。

Similarly, the target white brightness L of the display can be set according to the first intermediate red brightness proportion, the first intermediate green brightness proportion and the first intermediate blue brightness proportion corresponding to the 50 th gray scale, the 75 th gray scale, and up to the 250 th gray scale_wAnd respectively calculating to obtain a second red brightness, a second green brightness and a second blue brightness under the corresponding gray scale.

Or, optionally, in S70, obtaining color coordinates of red, green, and blue corresponding to the R gray scales according to the list, and calculating a second red luminance, a second green luminance, and a second blue luminance corresponding to each gray scale of the R gray scales according to the target white color coordinate and the target white luminance, as shown in fig. 6, the method includes:

s7001, color coordinates of red, green and blue corresponding to the R gray scales are obtained according to the list, and a first middle red brightness proportion, a first middle green brightness proportion and a first middle blue brightness proportion under the R gray scales are respectively obtained through calculation according to the target white color coordinate.

In an example, according to the gray scale selected in S60, the list obtained in S50 is searched, and the 25 th gray scale, the 50 th gray scale, and the 75 th gray scale are respectively obtained until the color coordinates of red, green, and blue corresponding to the 250 th gray scale. And according to the target white color coordinate (x)_w,y_w) Substituting the formula (eight), the formula (nine) and the formula (ten), the 25 th gray scale, the 50 th gray scale and the 75 th gray scale can be obtained by calculation in sequence until the 25 th gray scale, the 50 th gray scale and the 75 th gray scale reach theThe first intermediate red brightness proportion, the first intermediate green brightness proportion and the first intermediate blue brightness proportion corresponding to the 250 gray scale.

S7002, respectively calculating and obtaining first intermediate red brightness, first intermediate green brightness and first intermediate blue brightness corresponding to each gray scale of the R gray scales according to the first intermediate red brightness proportion, the first intermediate green brightness proportion, the first intermediate blue brightness proportion and the target white brightness corresponding to the R gray scales.

Illustratively, according to the 25 th gray scale, the 50 th gray scale and the 75 th gray scale obtained in the step S7002, the first intermediate red brightness proportion, the first intermediate green brightness proportion and the first intermediate blue brightness proportion corresponding to the up to 250 th gray scale are respectively matched with the set target white brightness L of the display_wAnd multiplying to obtain the 25 th gray scale, the 50 th gray scale and the 75 th gray scale until the first intermediate red brightness, the first intermediate green brightness and the first intermediate blue brightness corresponding to the 250 th gray scale.

On the basis, the following steps are cycled for at least one time:

s7003, according to the first middle red brightness, the first middle green brightness and the first middle blue brightness corresponding to each gray scale of the R gray scales, the color coordinates of the red, the green and the blue corresponding to the R gray scales are obtained from the list, and according to the target white color coordinate, the second middle red brightness proportion, the second middle green brightness proportion and the second middle blue brightness proportion corresponding to each gray scale of the R gray scales are obtained through calculation.

Exemplary, the second red luminance corresponding to the 25 th gray scale obtained in S7002 is L'_R25And the second green luminance is L'_G25And the second blue luminance is L'_B25The corresponding red color coordinate is obtained from the list as (x'_R25,y′_R25) And the green color coordinate is (x'_G25,y′_G25) And the blue color coordinate is (x'_B25,y′_B25) And the set target white color coordinate is (x)_w,y_w) Substituting the formula (eight), the formula (nine) and the formula (ten) to obtain a second intermediate red brightness ratio and a second intermediate green brightness corresponding to the 25 th gray scaleThe degree ratio and the second intermediate blue luminance ratio are respectively:

P′_b25＝1-P′_r25-P′_g25。

wherein, the resulting P 'is calculated'_r25Is a second intermediate red luminance proportion, P'_g25Is a second intermediate green luminance proportion, P'_b25The second intermediate blue luminance ratio corresponding to the 25 th gray scale.

Similarly, the 50 th gray scale and the 75 th gray scale are obtained through calculation in sequence until the second intermediate red brightness proportion, the second intermediate green brightness proportion and the second intermediate blue brightness proportion corresponding to the 250 th gray scale.

S7004, calculating to obtain second intermediate red brightness, second intermediate green brightness and second intermediate blue brightness corresponding to each gray scale of the R gray scales according to the second intermediate red brightness proportion, the second intermediate green brightness proportion, the second intermediate blue brightness proportion and the target white brightness corresponding to each gray scale of the R gray scales.

Example second intermediate Red luminance proportion P 'corresponding to the 25 th Gray level obtained from S7003'_r25Second intermediate Green luminance proportion P'_g25Second intermediate blue luminance proportion P'_b25And a set target white luminance L of the display_wThrough L_w×P'_r25＝L″_R25，L_w×P'_g25＝L″_G25，L_w×P'_b25＝L″_B25Respectively calculating to obtain a second intermediate red brightness L' corresponding to the 25 th gray scale_R25The second intermediate green lightness is L_G25And a second intermediate blue lightness of L ″_B25。

Similarly, the target white brightness L of the display can be set according to the second intermediate red brightness proportion, the second intermediate green brightness proportion and the second intermediate blue brightness proportion corresponding to the 50 th gray scale, the 75 th gray scale, and up to the 250 th gray scale_wAnd respectively calculating to obtain a second intermediate red brightness, a second intermediate green brightness and a second intermediate blue brightness under the corresponding gray scale.

S7005, once per cycle, the second intermediate red luminance, the second intermediate green luminance, and the second intermediate blue luminance obtained in the previous cycle are respectively used as the first intermediate red luminance, the first intermediate green luminance, and the first intermediate blue luminance.

For example, the calculation process is repeated once again on the basis of S7004, the 25 th gray scale, the 50 th gray scale and the 75 th gray scale obtained in S7004 are used until the second intermediate red luminance corresponding to the 250 th gray scale is used as the first intermediate red luminance, the 25 th gray scale, the 50 th gray scale and the 75 th gray scale obtained in S7004 are used until the second intermediate green luminance corresponding to the 250 th gray scale is used as the first intermediate green luminance, the 25 th gray scale, the 50 th gray scale and the 75 th gray scale obtained in S7004 are used until the second intermediate blue luminance corresponding to the 250 th gray scale is used as the first intermediate blue luminance, and then the calculation process is performed once again according to the methods of S7003 and S7004.

The number of cycles may be set as required, but the present invention is not limited thereto.

S7006, after the last cycle is completed, the second intermediate red luminance, the second intermediate green luminance, and the second intermediate blue luminance are respectively regarded as the second red luminance, the second green luminance, and the second blue luminance.

Illustratively, after the last cycle is completed, the second intermediate red lightness corresponding to the 25 th gray scale is L'_R25Taking the second red brightness as the second red brightness corresponding to the 25 th gray scale; the second intermediate green luminance corresponding to the 25 th gray scale is L ""_G25Taking the second green brightness as the second green brightness corresponding to the 25 th gray scale; the second intermediate blue luminance corresponding to the 25 th gray scale is L ""_B25This is set as the second blue luminance corresponding to the 25 th gray scale.

Similarly, the 50 th gray scale and the 75 th gray scale, and the second intermediate red brightness, the second intermediate green brightness and the second intermediate blue brightness corresponding to the 250 th gray scale are respectively used as the 50 th gray scale and the 75 th gray scale, and the second red brightness, the second green brightness and the second blue brightness corresponding to the 250 th gray scale.

S80, obtaining and storing a red brightness correction relation according to the second red brightness corresponding to each gray scale of the R gray scales and the red brightness value of each gray scale of the R gray scales acquired from the list; obtaining and storing a green brightness correction relation according to the second green brightness corresponding to each gray scale of the R gray scales and the green brightness value of each gray scale of the R gray scales acquired from the list; and obtaining and storing a blue brightness correction relation according to the second blue brightness corresponding to each gray scale of the R gray scales and the blue brightness value of each gray scale of the R gray scales acquired from the list.

The embodiment of the invention provides a method for acquiring a tricolor brightness correction relationship, which comprises the steps of firstly, acquiring stable red color coordinates, green color coordinates and blue color coordinates when a red picture, a green picture and a blue picture are displayed by a display, and calculating to obtain initial red brightness, initial green brightness and initial blue brightness according to a set target white color coordinate and a set target white brightness; then, calculating to obtain the brightness values of the red, the green and the blue under each gray scale through the initial red brightness, the initial green brightness, the initial blue brightness and the gamma value; generating a list of corresponding relations of gray scales, brightness values and color coordinates of the red, the green and the blue respectively by measuring the color coordinates of the red, the green and the blue under each gray scale; then, according to the color coordinates of red, green and blue corresponding to the R gray scales selected from the list, and according to the target white color coordinate and the target white brightness, calculating to obtain a second red brightness, a second green brightness and a second blue brightness corresponding to each gray scale of the R gray scales; and finally, respectively obtaining and storing the brightness correction relations of red, green and blue according to the second red brightness, the second green brightness and the second blue brightness corresponding to each gray scale of the R gray scales and the red brightness value, the green brightness value and the blue brightness value of each gray scale of the R gray scales acquired from the list. Therefore, the method can simply and quickly acquire the tricolor brightness correction relationship, and when the tricolor brightness of the display is corrected, the method is applied to keep the white color temperature of the display consistent.

Optionally, in the above S80, a red brightness correction relationship is obtained and stored according to the second red brightness corresponding to each gray scale of the R gray scales and the red brightness value of each gray scale of the R gray scales acquired from the list; obtaining and storing a green brightness correction relation according to the second green brightness corresponding to each gray scale of the R gray scales and the green brightness value of each gray scale of the R gray scales acquired from the list; obtaining and storing a blue brightness correction relationship according to the second blue brightness corresponding to each gray scale of the R gray scales and the blue brightness value of each gray scale of the R gray scales acquired from the list, as shown in fig. 7, including:

s801, obtaining a first ratio of second red brightness and first red brightness corresponding to each gray scale of the R gray scales according to second red brightness corresponding to each gray scale of the R gray scales and red brightness value of each gray scale of the R gray scales obtained from the list, and performing linear difference processing or fitting processing on the first ratio to obtain a red brightness correction relation and storing the red brightness correction relation.

S802, according to the second green brightness corresponding to each gray scale of the R gray scales and the green brightness value of each gray scale of the R gray scales acquired from the list, obtaining a second ratio of the second green brightness corresponding to each gray scale of the R gray scales to the green brightness value, and performing linear difference processing or fitting processing on the second ratio to obtain a green brightness correction relation and store the green brightness correction relation.

S803, according to the second blue luminance corresponding to each gray scale of the R gray scales and the blue luminance value of each gray scale of the R gray scales obtained from the list, obtaining a third ratio of the second blue luminance corresponding to each gray scale of the R gray scales to the blue luminance value, and performing linear difference processing or fitting processing on the third ratio to obtain a blue luminance correction relationship and store the blue luminance correction relationship.

Illustratively, the second red luminance L 'corresponding to the 25 th gray scale obtained in S70'_R25And the red brightness value at the found 25 th gray scale is L from the list generated in S50_R25Thereby obtaining a second red luminance L 'corresponding to the 25 th gray scale'_R25And a red luminance value L_R25Has a first ratio of

The second green luminance corresponding to the 25 th gray scale obtained in S70 is L'_G25And the value of the green luminance at the found 25 th gray scale from the list generated in S50 is L_G25Thereby obtaining a second green luminance L 'corresponding to the 25 th gray scale'_G25And a green luminance value L_G25A second ratio of

L 'is the second blue luminance corresponding to the 25 th gray scale obtained in S70'_B25And the blue luminance value at the found 25 th gray scale is L from the list generated in S50_B25Thereby obtaining a second blue luminance L 'corresponding to the 25 th gray scale'_B25And a blue luminance value L_B25Has a third ratio of

Similarly, the first ratio corresponding to the 50 th gray scale is obtained

The second ratio is

The third ratio is

Class i (in order)And obtaining the 75 th gray scale until the first ratio, the second ratio and the third ratio corresponding to the 250 th gray scale.

Based on the above, the first ratios corresponding to the 25 th gray scale, the 50 th gray scale and the 75 th gray scale until the 250 th gray scale are obtained

Linear difference processing or fitting processing is carried out on the red luminance correction coefficient to obtain the red luminance correction coefficient of L'_RX＝F(L_RX) And store, wherein F (L)_RX) Is about L_RXIs used as a function of (1).

Similarly, the 25 th gray scale, the 50 th gray scale and the 75 th gray scale of the green color are obtained until the second ratio corresponding to the 250 th gray scale is respectively

Linear difference processing or fitting processing is carried out on the green brightness correction relation to obtain L'_GX＝F(L_GX) And store, wherein F (L)_GX) Is about L_GXIs used as a function of (1).

Similarly, the third ratios of blue at the 25 th gray scale, the 50 th gray scale and the 75 th gray scale to the 250 th gray scale are obtained

Linear difference processing or fitting processing is carried out on the blue color luminance correction coefficient to obtain the blue color luminance correction coefficient of L'_BX＝F(L_BX) And store, wherein F (L)_BX) Is about L_BXIs used as a function of (1).

Alternatively, for example, the second intermediate red lightness L "", which corresponds to the 25 th gray scale obtained in S7006_R25It is taken as the second red luminance, and the red luminance value L at the 25 th gray scale found from the list generated in S50_R25Thus, the second red luminance L "", which corresponds to the 25 th gray scale, is obtained_R25And a red luminance value L_R25Has a first ratio of

The second intermediate green luminance corresponding to the 25 th gray scale obtained in S7006 is L ""_G25It is regarded as the second green luminance, and the green luminance value L at the 25 th gray level found from the list generated in S50_G25Thus, a second green luminance L "", which corresponds to the 25 th gray scale, is obtained_G25And a green luminance value L_G25A second ratio of

The second intermediate blue luminance corresponding to the 25 th gray scale obtained in S7006 is L ""_B25It is regarded as the second blue luminance, and the blue luminance value L at the 25 th gray level found from the list generated in S50_B25Thus, the second blue luminance L "", which corresponds to the 25 th gray scale, is obtained_B25And a blue luminance value L_B25Has a third ratio of

Similarly, the first ratio corresponding to the 50 th gray scale is obtained

The second ratio is

The third ratio is

And repeating the steps to obtain the 75 th gray scale until the first ratio, the second ratio and the third ratio corresponding to the 250 th gray scale.

Subjecting it to linear difference processing or fittingProcessing to obtain a red brightness correction relation L'_RX＝F(L_RX) And store, wherein F (L)_RX) Is about L_RXIs used as a function of (1).

Linear difference processing or fitting processing is carried out on the green color image to obtain a green color brightness correction relation L'_GX＝F(L_GX) And store, wherein F (L)_GX) Is about L_GXIs used as a function of (1).

Linear difference processing or fitting processing is carried out on the blue color image to obtain a blue color brightness correction relation L'_BX＝F(L_BX) And store, wherein F (L)_BX) Is about L_BXIs used as a function of (1).

An embodiment of the present invention further provides a computer device, which is characterized by including a storage unit and a processing unit; the storage unit stores therein a computer program executable on the processing unit; the processing unit implements the method for obtaining the three primary color luminance correction relationship as described above when executing the computer program.

An embodiment of the present invention further provides a computer readable medium, which stores a computer program, wherein the computer program is executed by a processor to implement the method for obtaining the three-primary-color luminance correction relationship as described above.

An embodiment of the present invention further provides a method for correcting a display, as shown in fig. 8, including:

s1001, measuring the red brightness, the green brightness and the blue brightness of the display at each gray scale.

S1002, calculating to obtain target red brightness, target green brightness and target blue brightness under each gray scale according to the red brightness correction relation, the green brightness correction relation and the blue brightness correction relation obtained by the obtaining method of the three-primary-color brightness correction relation, and the red brightness, the green brightness and the blue brightness under each gray scale obtained by measurement.

S1003, obtaining target driving voltages corresponding to the target red brightness, the target green brightness and the target blue brightness under each gray scale.

In S50, when the lists of the correspondence relationships between the gray levels, the luminance values, and the color coordinates for the red, green, and blue colors are generated, the driving voltages in the driving circuits may be recorded at the same time, and the one-to-one correspondence relationships between the luminance values, the color coordinates, and the driving voltages for the red, green, and blue colors may be established for each gray level. Therefore, the list can be searched according to the target red brightness, the target green brightness and the target blue brightness of each gray scale, and the target driving voltages corresponding to the target red brightness, the target green brightness and the target blue brightness of each gray scale are obtained through the corresponding relation.

In addition, the one-to-one correspondence relationship between the luminance values of red, green, and blue and the driving voltage may be established on a per gray scale basis through other steps, which is not limited in the present invention.

S1004, adjusting the driving voltage of each gray scale of the display to the target driving voltage, so that the red brightness of each gray scale is equal to the target red brightness, the green brightness of each gray scale is equal to the target green brightness, and the blue brightness of each gray scale is equal to the target blue brightness.

It can be understood that the red brightness under each gray scale reaches the target red brightness, the green brightness under each gray scale reaches the target green brightness, and when the blue brightness under each gray scale reaches the target blue brightness, the achromatic color coordinates obtained by mixing the three primary colors under the gray scale are consistent with the target white color coordinates, so that all the achromatic color coordinates are corrected and consistent in the whole gray scale range, and further, the white color temperature of the display is kept consistent.

In the correction method of the display provided by the embodiment of the invention, the target red brightness, the target green brightness and the target blue brightness of each gray scale are obtained by calculating the red brightness correction relationship, the green brightness correction relationship and the blue brightness correction relationship obtained by the obtaining method of the three-primary-color brightness correction relationship and the measured red brightness, green brightness and blue brightness of each gray scale, then the target driving voltage corresponding to the obtained target red brightness, target green brightness and target blue brightness of each gray scale is referred, the driving voltage of each gray scale of the display is adjusted to the target driving voltage, so that the red brightness of each gray scale is up to the target red brightness, the green brightness of each gray scale is up to the target green brightness, and the blue brightness of each gray scale is up to the target blue brightness, so that the white color coordinates of the display under each gray scale are kept consistent, and the white color temperature remains uniform.

An embodiment of the present invention further provides a correction apparatus for a display, as shown in fig. 9, including:

the measuring module 1 is configured to measure the red brightness, the green brightness and the blue brightness of the display at each gray scale;

the calculating module 2 is configured to calculate and obtain target red luminance, target green luminance and target blue luminance under each gray scale according to the red luminance correction relationship, the green luminance correction relationship and the blue luminance correction relationship obtained by the obtaining method of the three-primary-color luminance correction relationship, and the measured red luminance, green luminance and blue luminance under each gray scale;

the acquisition module 3 is configured to acquire target driving voltages corresponding to target red brightness, target green brightness and target blue brightness under each gray scale;

the adjusting module 4 is configured to adjust the driving voltage of each gray scale of the display to the target driving voltage, so that the red brightness of each gray scale is adjusted to the target red brightness, the green brightness of each gray scale is adjusted to the target green brightness, and the blue brightness of each gray scale is adjusted to the target blue brightness.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method for obtaining a three-primary-color brightness correction relationship is characterized by comprising the following steps:

setting a target white color coordinate, a target white brightness and a gamma value;

when respectively obtaining the display and showing red picture, green picture and blue picture, stable red color coordinate, green color coordinate and blue color coordinate include:

in the brightness measurement range when the red picture is displayed, the brightness of the red picture displayed by the display is gradually increased, the red color coordinate is synchronously measured, the difference value operation is carried out on the red color coordinate and the red color coordinate obtained by the last measurement, and when the difference value is less than or equal to a first threshold value, the corresponding red color coordinate is a stable red color coordinate;

in the brightness measurement range when the green picture is displayed, the brightness of the green picture displayed by the display is gradually increased, the green color coordinate is synchronously measured, the difference value operation is carried out on the green color coordinate and the green color coordinate obtained by the last measurement, and when the difference value is less than or equal to a second threshold value, the corresponding green color coordinate is a stable green color coordinate;

in the brightness measurement range when displaying the blue picture, gradually increasing the brightness of the blue picture displayed by the display, synchronously measuring the blue color coordinate, performing difference operation with the blue color coordinate obtained by the last measurement, and obtaining the corresponding blue color coordinate as the stable blue color coordinate when the difference is less than or equal to a third threshold value;

calculating to obtain initial red brightness, initial green brightness and initial blue brightness according to the stable red color coordinate, the stable green color coordinate and the stable blue color coordinate, the stable target white color coordinate and the stable target white brightness, the stable target white brightness and the stable target white brightness, wherein the stable target white brightness comprises the following steps:

calculating to obtain an initial red brightness proportion, an initial green brightness proportion and an initial blue brightness proportion according to the stable red color coordinate, the stable green color coordinate, the stable blue color coordinate and the target white color coordinate by utilizing a relational expression of the three primary color coordinates and the brightness proportions in the CIE XYZ system; calculating to obtain initial red brightness, initial green brightness and initial blue brightness according to the initial red brightness proportion, the initial green brightness proportion, the initial blue brightness proportion and the target white brightness;

calculating to obtain corresponding brightness values of red, green and blue under each gray scale according to the initial red brightness, the initial green brightness, the initial blue brightness and the gamma value;

measuring the color coordinates of the red, green and blue under each gray scale, and generating a list of corresponding relations of the gray scales, the brightness values and the color coordinates of the red, green and blue respectively;

selecting R gray scales; r is more than or equal to 2 and is a positive integer;

acquiring color coordinates of red, green and blue corresponding to the R gray scales according to the list, and calculating to obtain second red brightness, second green brightness and second blue brightness corresponding to each gray scale of the R gray scales according to the target white color coordinate and the target white brightness;

obtaining and storing a red brightness correction relation according to the second red brightness corresponding to each gray scale of the R gray scales and the red brightness value of each gray scale of the R gray scales acquired from the list; obtaining and storing a green brightness correction relation according to the second green brightness corresponding to each gray scale of the R gray scales and the green brightness value of each gray scale of the R gray scales acquired from the list; and obtaining and storing a blue brightness correction relation according to the second blue brightness corresponding to each gray scale of the R gray scales and the blue brightness value of each gray scale of the R gray scales acquired from the list.

2. The method according to claim 1, wherein calculating brightness values corresponding to red, green and blue at each gray level according to the initial red brightness, the initial green brightness, the initial blue brightness, and the gamma value comprises:

acquiring the number of gray scales of a display;

taking the initial red brightness, the initial green brightness and the initial blue brightness as corresponding brightness values of red, green and blue under the maximum gray scale respectively;

Respectively calculating to obtain the brightness values of the red, the green and the blue corresponding to each gray scale;

3. The method according to claim 1, wherein obtaining color coordinates of red, green, and blue corresponding to the R gray scales according to the list, and obtaining a second red luminance, a second green luminance, and a second blue luminance corresponding to each gray scale of the R gray scales by calculating according to the target white color coordinate and the target white luminance comprises:

acquiring the color coordinates of red, green and blue corresponding to the R gray scales according to the list, and respectively calculating to obtain a first intermediate red brightness proportion, a first intermediate green brightness proportion and a first intermediate blue brightness proportion under the R gray scales according to the target white color coordinate;

and respectively calculating to obtain the second red brightness, the second green brightness and the second blue brightness corresponding to each gray scale of the R gray scales according to the first intermediate red brightness proportion, the first intermediate green brightness proportion, the first intermediate blue brightness proportion and the target white brightness which respectively correspond to the R gray scales.

4. The method according to claim 1, wherein obtaining color coordinates of red, green, and blue corresponding to the R gray scales according to the list, and obtaining a second red luminance, a second green luminance, and a second blue luminance corresponding to each gray scale of the R gray scales by calculating according to the target white color coordinate and the target white luminance comprises:

respectively calculating to obtain first intermediate red brightness, first intermediate green brightness and first intermediate blue brightness corresponding to each gray scale of the R gray scales according to a first intermediate red brightness proportion, a first intermediate green brightness proportion, a first intermediate blue brightness proportion and the target white brightness corresponding to the R gray scales;

circulating the following steps at least once:

according to the first middle red brightness, the first middle green brightness and the first middle blue brightness corresponding to each gray scale of the R gray scales, obtaining the color coordinates of red, green and blue corresponding to the R gray scales from the list, and according to the target white color coordinate, calculating to obtain a second middle red brightness proportion, a second middle green brightness proportion and a second middle blue brightness proportion corresponding to each gray scale of the R gray scales;

calculating to obtain a second intermediate red brightness, a second intermediate green brightness and a second intermediate blue brightness corresponding to each gray scale of the R gray scales according to a second intermediate red brightness proportion, a second intermediate green brightness proportion, a second intermediate blue brightness proportion and the target white brightness corresponding to each gray scale of the R gray scales;

taking the second intermediate red brightness, the second intermediate green brightness and the second intermediate blue brightness obtained in the previous time as the first intermediate red brightness, the first intermediate green brightness and the first intermediate blue brightness respectively once per cycle;

and after the last cycle is finished, respectively taking the second intermediate red brightness, the second intermediate green brightness and the second intermediate blue brightness as the second red brightness, the second green brightness and the second blue brightness.

5. The method according to claim 1, wherein a red luminance correction relationship is obtained and stored according to a second red luminance corresponding to each of the R gray scales and a red luminance value of each of the R gray scales obtained from the list; obtaining and storing a green brightness correction relation according to the second green brightness corresponding to each gray scale of the R gray scales and the green brightness value of each gray scale of the R gray scales acquired from the list; obtaining and storing a blue brightness correction relationship according to the second blue brightness corresponding to each gray scale of the R gray scales and the blue brightness value of each gray scale of the R gray scales acquired from the list, wherein the blue brightness correction relationship comprises:

obtaining a first ratio of second red brightness and red brightness value corresponding to each gray scale of the R gray scales according to the second red brightness corresponding to each gray scale of the R gray scales and the red brightness value of each gray scale of the R gray scales obtained from the list, and performing linear difference processing or fitting processing on the first ratio to obtain a red brightness correction relation and storing the red brightness correction relation;

obtaining a second ratio of the second green brightness corresponding to each gray scale of the R gray scales to the green brightness value according to the second green brightness corresponding to each gray scale of the R gray scales and the green brightness value of each gray scale of the R gray scales obtained from the list, and performing linear difference processing or fitting processing on the second ratio to obtain and store a green brightness correction relation;

and obtaining a third ratio of the second blue brightness corresponding to each gray scale of the R gray scales to the blue brightness value according to the second blue brightness corresponding to each gray scale of the R gray scales and the blue brightness value of each gray scale of the R gray scales obtained from the list, and performing linear difference processing or fitting processing on the third ratio to obtain a blue brightness correction relation and storing the blue brightness correction relation.

6. A computer device, comprising a storage unit and a processing unit; the storage unit stores therein a computer program executable on the processing unit; the processing unit realizes the method for obtaining the three primary color luminance correction relationship according to any one of claims 1 to 5 when executing the computer program.

7. A computer-readable medium storing a computer program, wherein the computer program, when executed by a processor, implements the method for obtaining a three primary color luminance correction relationship according to any one of claims 1 to 5.

8. A method for calibrating a display, comprising:

measuring the red brightness, the green brightness and the blue brightness of the display at each gray scale;

the method for obtaining a three-primary-color brightness correction relationship according to any one of claims 1 to 5 includes obtaining a red brightness correction relationship, a green brightness correction relationship, and a blue brightness correction relationship, and obtaining red brightness, green brightness, and blue brightness measured at each gray scale, and obtaining target red brightness, target green brightness, and target blue brightness at each gray scale by calculation;

acquiring target driving voltages corresponding to the target red brightness, the target green brightness and the target blue brightness under each gray scale;

and adjusting the driving voltage of each gray scale of the display to the target driving voltage, so that the red brightness of each gray scale is up to the target red brightness, the green brightness of each gray scale is up to the target green brightness, and the blue brightness of each gray scale is up to the target blue brightness.

9. A correction device for a display, comprising:

a measurement module configured to measure red, green, and blue luminance of the display at each gray level;

the calculation module is configured to calculate a target red brightness, a target green brightness and a target blue brightness under each gray scale according to the red brightness correction relationship, the green brightness correction relationship and the blue brightness correction relationship obtained by the method for obtaining a three-primary-color brightness correction relationship according to any one of claims 1 to 5, and the measured red brightness, green brightness and blue brightness under each gray scale;

the acquisition module is configured to acquire target driving voltages corresponding to target red brightness, target green brightness and target blue brightness under each gray scale;

the adjusting module is configured to adjust the driving voltage of each gray scale of the display to a target driving voltage, so that the red brightness of each gray scale is up to a target red brightness, the green brightness of each gray scale is up to a target green brightness, and the blue brightness of each gray scale is up to a target blue brightness.